Journal of Vibration Testing and System Dynamics 5(3) (2021) 207--219 | DOI:10.5890/JVTSD.2021.09.001

Inna Emelyanova

Campbell, California, USA

Abstract

Two dates coincided in 2019: the centenary of the full member of Russian Academy of Sciences Lev Vasilievich Ovsyannikov (April 22, 1919 -- May 23, 2014) and the eightieth anniversary of his follower, professor Nail Hairullovich Ibragimov (January 18, 1939 -- November 04, 2018). Through the efforts of them and their numerous students and followers, Sophus Lie's theory of local transformation groups was revived and received promising development.

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